Cratena affinis is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Facelinidae.MolluscaBase (2018). Cratena affinis (Baba, 1949). Accessed on 2018-02-17.
Distribution This species was described from Sagami Bay, Japan.Rudman, W.B., 2002 (November 25) Cratena affinis (Baba, 1949). [In] Sea Slug Forum. Australian Museum, Sydney.
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